IP Communications Voice/Fax Network Module
The IP Communications Voice/Fax Network Module feature provides the ability to directly connect the
PSTN and legacy telephony equipment to Cisco 2600XM series, Cisco 2691, Cisco 3600 series, and
Cisco 3700 series multiservice routers, enabling applications such as IP telephony, toll bypass, and full
gateway integration. The voice WAN interface cards (VWICs) supported by the new network modules
include 2- and 4-port FXS; 2- and 4-port FXO; 2-port DID, E&M, and BRI (S/T); and 1- and 2-port
T1/E1.
Feature History for the IP Communications Voice/Fax Network Module
Release
Modification
12.2(15)ZJ
This feature was introduced.
12.3(4)T
This feature was integrated into Cisco IOS Release 12.3(4)T.
12.3(11)T2
The groundstart auto-tip command was added to the command-line
interface and the feature was integrated into Cisco IOS
Release 12.3(11)T2. This new command is not supported on the
Cisco 1700 series platform.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image
support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on
Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at
the login dialog box and follow the instructions that appear.
Contents
•
Prerequisites for the IP Communications Voice/Fax Network Module, page 2
•
Restrictions for the IP Communications Voice/Fax Network Module, page 2
•
Information About the IP Communications Voice/Fax Network Module, page 2
•
How to Configure the IP Communications Voice/Fax Network Module, page 4
•
Troubleshooting Tips, page 17
•
Additional References, page 18
Corporate Headquarters:
Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA
Copyright © 2004 Cisco Systems, Inc. All rights reserved.
IP Communications Voice/Fax Network Module
Prerequisites for the IP Communications Voice/Fax Network Module
•
Command Reference, page 20
•
Glossary, page 39
Prerequisites for the IP Communications Voice/Fax Network
Module
The recommended minimum Cisco IOS Release for this feature is Release 12.3(7)T. For optimum
results, use Cisco IOS Release 12.3(11)T2.
This feature requires 32 MB of Flash memory, 1.1 MB of I/O memory, and 96 MB of RAM (128 MB of
RAM is required for the Cisco 2600XM series and the Cisco 3700 series).
Restrictions for the IP Communications Voice/Fax Network
Module
The IP Communications Voice/Fax Network Module feature does not currently offer echo cancellation
on the VWICs configured as T1 interfaces, which may result in a degradation of service in some
instances.
Information About the IP Communications Voice/Fax
Network Module
This section provides information about the following:
•
IP Communications Voice/Fax Network Module Software Modules, page 2
•
IP Communications Voice/Fax Network Module Software Modules, page 2
•
Channel Availability for DSPs Based on Codecs, page 4
IP Communications Voice/Fax Network Module Software Modules
The IP Communications Voice/Fax Network Module feature is composed of software modules that offer
the following features on voice network modules:
•
Channel group support for up to 32 channels
•
Flex option for configuring codec complexity—This new option allows the digital signal processor
(DSP) to process up to 16 channels. In addition to continuing support for configuring a fixed number
of channels per DSP, the flex option enables the DSP to handle a flexible number of channels. The
total number of supported channels varies from 6 to 16, depending on which codec is used for a call.
Therefore, the channel density varies from 6 per DSP (high-complexity codec) to 16 per DSP (g.711
codec).
– Oversubscription—In flex mode, you can connect (or configure in the case of DS0 groups and
PRI groups) more voice channels to the module than the DSPs can accommodate. If all voice
channels should go active simultaneously, the DSPs will be oversubscribed and calls that are
unable to allocate a DSP resource will fail to connect.
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•
Software-based echo cancellation up to 32-millisecond conversion
•
Digital: BRI, PRI, and CAS
•
Analog: FXS, FXO, E&M, and DID
•
Signaling channel allocation
•
Voice channel allocation
•
Voice port independent channel allocation
•
Hairpinning:
– Digital to digital (same card)
– Analog to digital (same card)
•
Channel bank support—Analog voice ports are internally connected to a DS0 time slot on a digital
T1/E1 interface. All the signaling is transparently sent between the analog voice port and DS0 time
slot, and will not be seen by the higher layer voice software.
•
DSP crash recovery
•
FXO and FXS Caller ID Type 1 and Type 2
•
Trunk alarm handling
IP Communications Voice/Fax Network Module Capabilities
Table 1 provides information about the three network modules that support this feature.
Table 1
IP Communications Voice/Fax Network Module Capabilities
Number of Channels
Module
Medium
High
DSPs Complexity Complexity Flex
T1/E1 Ports
Voice Interface Cards
(VICs)
NM-HD-1V1
1
4
4
4
0
One 2- to 4-port VIC
NM-HD-2V
1
8
6
6 to 8
0
Two 2- to 4-port VICs
24
18
18 to 48
4
Two 2- to 4-port VICs or
one VIC and one T1/E1
interface VIC or
two T1/E1 interface VICs
NM-HD-2VE 3
1. Number of channels depends on the VIC module installed in the router, not the number of DSPs.
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Channel Availability for DSPs Based on Codecs
Table 2 lists the number of channels available on each DSP for the codecs supported by the IP
Communications Voice/Fax Network Module feature.
Table 2
Channels on DSP for Codecs Supported by the IP Communications Voice/Fax Network
Module
Channels per DSP
Codec
High-Complexity Medium Complexity
Flex Complexity
G.711 (u-law, a-law)
6
8
161
Fax/modem pass-through
6
8
16
Clear-channel codec
6
8
16
G.726 (32K, 24K, 16K)
6
8
8
GSMFR
6
8
8
Fax relay
6
8
8
G.729, G.729B, G.729A, G.729AB
6
8
8
G.728
6
Not supported
6
G.723.1 (5.3K, 6.3K)
6
Not supported
6
G.723.1A (5.3K, 6.3K)
6
Not supported
6
GSMEFR
6
Not supported
6
1. Applicable to the NM-HD-2VE only. The limitation on the number of calls is based on the network module, not the DSP (that
is, even though one DSP supports 16 channels, the NM-HD-2V supports only 8 G.711 calls due to the number of analog ports).
How to Configure the IP Communications Voice/Fax Network
Module
This section contains the following procedures:
•
Configuring the Voice Card for the Flex Option on the IP Communications Voice/Fax Network
Module, page 4
•
Configuring Digital Interfaces for the IP Communications Voice/Fax Network Module, page 7
•
Configuring Channel Bank Support for the IP Communications Voice/Fax Network Module,
page 12
Configuring the Voice Card for the Flex Option on the IP Communications
Voice/Fax Network Module
To enable the IP Communications Voice/Fax Network Module feature, perform this task to configure the
voice card for the flex option in codec complexity.
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How to Configure the IP Communications Voice/Fax Network Module
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
voice-card slot
4.
codec complexity {flex | high | medium}
5.
voice local-bypass
6.
exit
DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
voice-card slot
Example:
Router(config)# voice-card 1
Enters voice-card configuration mode and specifies the slot
location.
•
For the slot argument, specify a value from 0 to 5,
depending on your router.
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Step 4
Command or Action
Purpose
codec complexity {flex | high | medium}
Specifies the codec complexity based on the codec standard
you are using.
Example:
•
flex— Up to 16 calls can be completed per DSP. The
number of supported calls varies from 6 to 16,
depending on the codec used for a call.
•
high—Up to six voice or fax calls can be completed per
DSP, using the following codecs: G.711, G.726, G.729,
G.723.1, G.723.1 Annex A, G.728, and GSMEFR.
Router(config-voicecard)# codec complexity flex
Note
•
medium—Up to eight voice or fax calls can be
completed per DSP, using the following codecs: G.711,
G.726, G.729 Annex A, G.729 Annex B, G.729 Annex
B with Annex A, GSMFR, and fax relay.
•
The keyword that you specify for the codec complexity
command affects the choice of codecs available using
the codec dial-peer voice configuration command.
Note
voice local-bypass
You cannot change codec complexity while
DS0 groups are defined. If they are already set
up, perform the following steps:
1.
Shut down the voice port associated with the
controller.
2.
Remove the DS0 group or PRI group under the T1
or E1 controller.
3.
Enter the voice-card slot command, and then
change the codec complexity.
Note
Step 5
High-complexity codecs support lower call
density than medium-complexity codecs.
This procedure applies only to T1 and E1
controllers; it is not valid for analog voice
ports.
Configures local calls to bypass the DSP.
•
Using this command disables hairpinning.
Example:
Router(config-voicecard)# voice local-bypass
Step 6
Exits voice-card configuration mode and returns the router
to global configuration mode.
exit
Example:
Router(config-voicecard)# exit
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Configuring Digital Interfaces for the IP Communications Voice/Fax Network
Module
Perform this task to configure the digital interfaces.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
controller {t1 | e1} slot/port
4.
clock source {line [primary] | internal}
5.
framing {sf | esf}
or
framing {crc4 | no-crc4}
6.
linecode {b8zs | ami}
or
linecode {ami | hdb3}
7.
cablelength long {gain26 | gain36} {-15db | -22.5db | -7.5db | 0db}
or
cablelength short {133 | 266 | 399 | 533 | 655}
8.
ds0-group ds0-group-number timeslots timeslot-list type {e&m-delay-dial | e&m-fgd |
e&m-immediate-start | e&m-wink-start | ext-sig | fgd-eana | fgd-os | fxo-ground-start |
fxo-loop-start | fxs-ground-start | fxs-loop-start | none}
or
pri-group [timeslots range]
or
channel-group channel-group-number timeslots range [speed kbps]
or
tdm-group tdm-group-number timeslots timeslot-list type {e&m | fxs [loop-start | ground-start]
| fxo [loop-start | ground-start]}
9.
exit
10. connect connection-id {t1 | e1} slot/port1 tdm-group1 {t1 | e1} slot/port2 tdm-group2
11. end
12. no shutdown
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DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
controller {t1 | e1} slot/port
Example:
Router(config)# controller t1 1/1
Enters controller configuration mode and identifies the
controller type (T1 or E1) and a slot and port for
configuration commands that specifically apply to the T1 or
E1 interface.
•
Step 4
clock source {line [primary] | internal}
Valid values for the slot and port arguments are 0 and 1.
Specifies the clock source.
•
Example:
Router(config-controller)# clock source line
line—Specifies that the clock source is derived from
the active line. This is the default.
– When both ports are set to line clocking with no
primary specification, port 0 is the default primary
clock source and port 1 is the default secondary
clock source.
– When both ports are set to line and one port is set
as the primary clock source, the other port is by
default the backup or secondary source and is
loop-timed.
– If one port is set to clock source line or clock
source line primary and the other is set to clock
source internal, the internal port recovers clock
from the clock source line port if the clock source
line port is up. If it is down, then the internal port
generates its own clock.
•
Step 5
framing {sf | esf}
or
framing {crc4 | no-crc4}
Example:
Router(config-controller)# framing esf
or
Router(config-controller)# framing crc4
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If both ports are set to clock source internal, there is
only one clock source—internal.
Sets the framing according to your service provider’s
instructions.
•
For T1 controllers, select either sf or esf.
•
For E1 controllers, select either crc4 or no-crc4.
IP Communications Voice/Fax Network Module
How to Configure the IP Communications Voice/Fax Network Module
Step 6
Command or Action
Purpose
linecode {b8zs | ami}
Sets the line encoding according to your service provider’s
instructions.
or
linecode {ami | hdb3}
•
b8zs—Encodes a sequence of eight zeros in a unique
binary sequence to detect line-coding violations. Valid
for T1 only.
•
ami—Represents zeros using a 01 during each bit cell,
and represents ones by 11 or 00, alternately, during
each bit cell.
•
hdb3—Specifies high density binary3 (hdb3) as the
line-code type. Valid for the E1 controller only; the
default for E1 lines.
Example:
Router(config-controller)# linecode b8zs
or
Router(config-controller)# linecode hdb3
Step 7
cablelength long {gain26 | gain36} {-15db |
-22.5db | -7.5db | 0db}
Sets a cable length longer than 655 feet for a T1 link.
•
gain26—Specifies the decibel pulse gain at 26. This is
the default for pulse gain.
•
gain36—Specifies the decibel pulse gain at 36.
Example:
•
-15db—Specifies the decibel pulse rate at –15.
Router(config-controller)# cablelength long
gain36 -15db
•
-22.5db—Specifies the decibel pulse rate at –22.5.
or
•
-7.5db—Specifies the decibel pulse rate at –7.5.
Router(config-controller)# cablelength short
266
•
0db—Specifies the decibel pulse rate at 0 decibels.
This is the default for pulse rate.
or
cablelength short {133 | 266 | 399 | 533 | 655}
or
Sets a cable length of 655 feet or less for a T1 link.
•
There is no default for cablelength short.
– 133—Specifies a cable length from 0 to 133 feet.
– 266—Specifies a cable length from 134 to 266 feet.
– 399—Specifies a cable length from 267 to 399 feet.
– 533—Specifies a cable length from 400 to 533 feet.
– 655—Specifies a cable length from 534 to 655 feet.
Note
If you do not set the cable length, the system
defaults to cablelength long gain26 0db.
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Step 8
Command or Action
Purpose
ds0-group ds0-group-number timeslots
timeslot-list type {e&m-delay-dial | e&m-fgd |
e&m-immediate-start | e&m-wink-start |
fxo-ground-start | fxo-loop-start |
fxs-ground-start | fxs-loop-start}
Defines the T1 or E1 channels for use by compressed voice
calls and the signaling method the router uses to connect to
the PBX or central office (CO).
or
Note
pri-group [timeslots range]
or
channel-group channel-group-number timeslots
range [speed kbps]
or
tdm-group tdm-group-number timeslots
timeslot-list type {e&m | fxs [loop-start |
ground-start] | fxo [loop-start |
ground-start]}
•
The ds0-group command automatically creates a
logical voice port.
•
ds0-group-number—Value from 0 to 23 that identifies
the DS0 group.
•
timeslot-list—Single number, numbers separated by
commas, or a pair of numbers separated by a hyphen to
indicate a range of time slots. For T1, allowable values
are from 1 to 24; for E1, allowable values are from
1 to 31.
•
The signaling method selection for type depends on the
connection that you are making:
Example:
Router(config-controller)# ds0-group 10
timeslots 1,2, 7-9 type fxs-loop-start
or
Router(config-controller)# pri-group timeslots
1-5
If you modify the codec complexity command
parameters, you must first remove any existing DS0
groups, then reinstate them after the change to the
codec complexity.
or
– E&M connects PBX trunk lines (tie lines) and
telephone equipment. The wink and delay settings
both specify confirming signals between the
sending and receiving ends, or the immediate
setting stipulates no special offhook or onhook
signal.
Router(config-controller)# channel-group 0
timeslots 1-12
or
Router(config-controller)# tdm-group 12
timeslots 1, 5-7, 23 type fxo loop-start
– FXO connects a CO to a standard PBX interface
where permitted by local regulations.
– FXS connects basic telephone equipment and
PBXs.
Note
Operator ringback is not supported.
or
Specifies that the controller should be set up as a PRI
interface.
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•
For T1, the last defined channel is the D channel.
•
If a controller is configured as PRI, individual channel
groups cannot be configured on that controller.
•
The controller command must be entered before this
command can be used.
IP Communications Voice/Fax Network Module
How to Configure the IP Communications Voice/Fax Network Module
Command or Action
Purpose
or
Specifies a channel group number.
•
For T1 lines, channel-group numbers can be from
0 to 23.
•
For E1 lines, channel-group numbers can be from
0 to 30.
•
timeslots range—Specifies one or more time slots
separated by commas, or ranges of time slots belonging
to the channel group separated by a dash. The first time
slot is numbered 1. For a T1 controller, the time slots
range from 1 to 24. For an E1 controller, the time slots
range from 1 to 31.
•
speed kbps—(Optional) Specifies the speed of the
underlying DS0s in kilobits per second. Valid values
are 56 and 64.
– The default line speed when configuring a T1
controller is 56 kbps.
– The default line speed when configuring an E1
controller is 64 kbps.
or
(Optional) Specifies TDM channel groups for the
drop-and-insert (also called TDM cross-connect) function
with a two-port T1 multiflex trunk interface card.
•
tdm-group-number—Value from 0 to 23 that identifies
the channel group.
•
timeslot-list—Values are from 1 to 24.
•
type—Depends on the connection. The fxs and fxo
keywords allow you to specify a ground-start or
loop-start line.
Note
Step 9
exit
The group numbers for controller groups must
be unique. For example, a TDM group must not
have the same ID number as a DS0 group.
Exits controller configuration mode and returns to global
configuration mode.
Example:
Router(config-controller)# exit
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Step 10
Command or Action
Purpose
connect connection-id {t1 | e1} slot/port1
tdm-group1 {t1 | e1} slot/port2 tdm-group2
Defines connections among T1 or E1 controller ports for
drop-and-insert (also called TDM cross-connect).
Example:
Router(config)# connect connection1 t1 0/0 1 t1
0/1 2
•
connection-id—A name for this connection.
•
t1—Specifies a T1 port.
•
e1—Specifies an E1 port.
•
slot/port1—The location of the first T1 or E1 controller
to be connected. Valid values for slot and port are 0
and 1.
•
tdm-group1—The number identifier of the TDM group
associated with the first T1 or E1 controller port and
created by using the tdm-group command. Valid
values are from 0 to 23 for T1 and from 0 to 30 for E1.
•
slot/port2—The location of the second T1 or E1
controller port to be connected.
– Valid values for slot are from 0 to 5, depending on
the platform.
– Valid values for port are 0 to 3, depending on the
platform and the presence of a network module.
•
Step 11
tdm-group2—The number identifier of the TDM group
associated with the second T1 or E1 controller and
created by using the tdm-group command. Valid
values are from 0 to 23 for T1 and from 0 to 30 for E1.
Ends the current configuration session and returns to
privileged EXEC mode.
end
Example:
Router(config)# end
Step 12
Activates the controller.
no shutdown
Example:
Router(config)# no shutdown
Configuring Channel Bank Support for the IP Communications Voice/Fax
Network Module
The channel bank feature provides support for the TDM cross-connect functionality between analog
voice ports and digital DS0s on the same NM-HD-2VE using CAS signaling.
To establish a channel bank connection between an analog voice port and a T1 DS0, configure the
connect (voice-port) command in global configuration mode. To verify the channel bank connection, use
the show connection all command.
Restrictions
The configuration for cross-connect must be on the same network module.
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A maximum of four FXS or FXO ports can be cross-connected to a T1 interface.
A BRI-to-PRI cross-connect cannot be configured.
Analog-to-BRI/PRI cross-connect cannot be configured; the only connection for analog is
analog-to-T1/E1 CAS (ds0-group).
The local-bypass command has no effect when cross-connect is configured. It is applicable only to calls
that are hairpinned via POTS-to-POTS dial peers.
The DS0 group must contain only one time slot. The signaling type of the DS0 group must match that
of the analog voice port.
If the channel bank feature is used for the T1 controller, the rest of the unused DS0 group cannot be used
for fractional PRI signaling.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
controller {t1 | e1} slot/port
4.
ds0-group ds0-group-number timeslots timeslot-list type {e&m-delay-dial | e&m-fgd |
e&m-immediate-start | e&m-wink-start | fxo-ground-start | fxo-loop-start | fxs-ground-start |
fxs-loop-start}
5.
exit
6.
voice-port slot/port
7.
shutdown
8.
operation {2-wire | 4-wire}
9.
type {1 | 2 | 3 | 5}
10. signal {loop-start | ground-start}
or
signal {wink-start | immediate | delay-dial}
11. no shutdown
12. exit
13. connect connection-name voice-port voice-port-number {t1 | e1} controller-number
ds0-group-number
14. end
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DETAILED STEPS
Step 1
Command or Action
Purpose
enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Example:
Router> enable
Step 2
configure terminal
Enters global configuration mode.
Example:
Router# configure terminal
Step 3
controller {t1 | e1} slot/port
Example:
Router(config)# controller t1 1/0
Enters controller configuration mode and identifies the
controller type (T1 or E1) and a slot and port for
configuration commands that specifically apply to the T1 or
E1 interface.
•
Step 4
ds0-group ds0-group-number timeslots
timeslot-list type {e&m-delay-dial | e&m-fgd |
e&m-immediate-start | e&m-wink-start |
fxs-ground-start | fxs-loop-start |
fxo-ground-start | fxo-loop-start}
Valid values for the slot and port arguments are 0 and 1.
Defines the T1 or E1 channels for use by compressed voice
calls and the signaling method the router uses to connect to
the PBX or CO.
Note
Example:
Router(config-controller)# ds0-group 1
timeslots 1 type e&m-wink-start
If you modify the codec complexity command
parameters, you must first remove any existing DS0
groups, then reinstate them after the change to the
codec complexity.
•
The ds0-group command automatically creates a
logical voice port.
•
ds0-group-number Value from 0 to 23 that identifies the
DS0 group.
•
timeslot-list Single number, numbers separated by
commas, or a pair of numbers separated by a hyphen to
indicate a range of timeslots. For T1, allowable values
are 1 to 24; For E1, allowable values are 1 to 31.
The signaling method selection for type depends on the
connection that you are making:
Step 5
E&M connects PBX trunk lines (tie lines) and
telephone equipment. The wink and delay settings both
specify confirming signals between the sending and
receiving ends, or the immediate setting stipulates no
special offhook/onhook signal.
•
FXO connects a CO to a standard PBX interface where
permitted by local regulations.
•
FXS connects basic telephone equipment and PBXs.
Exits controller configuration mode and returns to global
configuration mode.
exit
Example:
Router(config-controller)# exit
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•
IP Communications Voice/Fax Network Module
How to Configure the IP Communications Voice/Fax Network Module
Step 6
Command or Action
Purpose
voice-port slot/port
Enters voice-port configuration mode and identifies a slot
and port for configuration parameters.
Example:
Router(config)# voice-port 2/1
Step 7
shutdown
Administratively shuts down the voice port.
Example:
Router(config-voiceport)# shutdown
Step 8
operation {2-wire | 4-wire}
Selects a specific cabling scheme for E&M ports:
•
This command is not applicable to FXS or FXO
interfaces because they are, by definition, 2-wire
interfaces.
•
Using this command on a voice port changes the
operation of both voice ports on a VPM card. The voice
port must be shut down and then opened again for the
new value to take effect.
Example:
Router(config-voiceport)# operation 4-wire
Step 9
type {1 | 2 | 3 | 5}
Specifies the E&M interface type.
•
Example:
1—Specifies:
– E—Output, relay to ground
Router(config-voiceport)# type 2
– M—Input, referenced to ground
•
2—Specifies:
– E—Output, relay to SG
– M—Input, referenced to ground
– SB—Feed for M, connected to –48V
– SG—Return for E, galvanically isolated from
ground
•
3—Specifies:
– E—Output, relay to ground
– M—Input, referenced to ground
– SB—Connected to –48V
– SG—Connected to ground
•
5—Specifies:
– E—Output, relay to ground
– M—Input, referenced to –48V
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How to Configure the IP Communications Voice/Fax Network Module
Step 10
Command or Action
Purpose
signal {loop-start | ground-start}
Defines the signal type to be used:
or
•
FXO and FXS voice ports:
signal {wink-start | immediate | delay-dial}
– loop-start Only one side of a connection can hang
up. This is the default setting for FXO and FXS
voice ports.
Example:
Router(config-voiceport)# signal loop-start
– ground-start Allows both sides of a connection to
or
place a call and to hang up.
Router(config-voiceport)# signal wink-start
or
•
E&M voice ports:
– wink-start—Indicates that the calling side seizes
the line by going off-hook on its E-lead then waits
for a short off-hook “wink” indication on its
M-lead from the called side before sending address
information as dual tone multifrequency (DTMF)
digits. This is the default setting for E&M voice
ports.
– immediate—Indicates that the calling side seizes
the line by going off-hook on its E-lead and sends
address information as DTMF digits.
– delay-dial—Indicates that the calling side seizes
the line by going off-hook on its E-lead. After a
timing interval, the calling side looks at the
supervision from the called side. If the supervision
is on-hook, the calling side starts sending
information as DTMF digits; otherwise, the calling
side waits until the called side goes on-hook and
then starts sending address information.
Step 11
no shutdown
Brings the voice port back to an up state adminstratively.
Example:
Router(config-voiceport)# no shutdown
Step 12
Exits voice-port configuration mode and returns to global
configuration mode.
exit
Example:
Router(config-voiceport)# exit
Step 13
connect connection-name voice-port
voice-port-number {t1 | e1} controller-number
ds0-group-number
Creates a named connection between two voice ports
associated with T1 or E1 interfaces where you have already
defined the groups by using the ds0-group command.
Example:
Router(config)# connect connect1 voice-port
1/1/0 t1 1/0 0
Step 14
Ends the current configuration session and returns to
privileged EXEC mode.
end
Example:
Router(config)# end
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Configuration Example for IP Communications Voice/Fax Network Module
Troubleshooting Tips
In some rare instances, if you have installed the VIC2-2FXO or the VIC2-4FXO and configured the voice
port for groundstart signaling, you may have difficulty connecting some outgoing calls. The problem
relates to the FXO groundstart voice port failing to detect a tip-ground acknowledgment, resulting in an
unsuccessful call setup.
If you encounter this problem, upgrade your Cisco IOS software image to the latest version (for example,
if you have Release 12.3(11)T installed, upgrade to Release 12.3(11)T2). This should fix the problem.
If this problem still occurs, you must enable the groundstart auto-tip command in the configuration of
the FXO voice port. When you are placing outgoing calls, this ensures that the circuit detects a
tip-ground acknowledgment from the far end and completes the connection within the time-out
parameter. For information about the groundstart auto-tip command, refer to the “groundstart auto-tip”
section on page 34.
For more information about this problem and more comprehensive troubleshooting steps, use the
reference provided in the “Technical Assistance” section on page 19. You can search the website using
keywords groundstart, analog, and fxo to obtain information on the topic described here.
Configuration Example for IP Communications Voice/Fax
Network Module
This section provides a configuration example for the following:
•
Channel Bank Support: Example
Channel Bank Support: Example
This section provides an example of partial output from the show command after channel bank support
has been configured:
Router# show startup-config
!
voice-card 1
!
voice-card 2
!
voice-card 4
!
!
controller T1 1/0
framing esf
linecode b8zs
ds0-group 1 timeslots 1 type e&m-wink-start
!
controller T1 2/0
framing esf
linecode b8zs
ds0-group 1 timeslots 1 type fxs-loop-start
!
controller T1 4/0
framing esf
linecode b8zs
ds0-group 1 timeslots 1 type fxo-loop-start
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Additional References
connect cbfxs voice-port 4/0/0 T1 4/0 1
!
!
connect cbem voice-port 1/0/0 T1 1/0 1
!
!
connect cbfxo voice-port 2/0/0 T1 2/0 1
!
!
!
voice-port 1/0/0
description E&M port
operation 4-wire
type 2
!
!
voice-port 2/0/0
description FXO port
!
voice-port 4/0/0
description FXS port
!
The following is an example of output from the show connection all command to list active connections:
Router# show connection all
ID Name Segment 1 Segment 2 State
==========================================================================
1
cbfxs voice-port 4/0/0 T1 4/0 01 UP
2
cbem voice-port 1/0/0 T1 1/0 01 UP
3
cbfxo voice-port 2/0/0 T1 2/0 01 UP
Additional References
The following sections provide references related to the IP Communications Voice/Fax Network Module
feature.
Related Documents
Related Topic
Document Title
Hardware installation instructions for network modules Cisco Network Modules Hardware Installation Guide
General information about voice configuration and
commands
Cisco IOS Voice Command Reference, Release 12.3T
Update to information about voice configuration cards Voice Network Module and Voice Interface Card Configuration Note
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IP Communications Voice/Fax Network Module
Additional References
Standards
Standards
Title
ITU-T for Q.931
ITU-T, Series Q Recommendations, Q.931 (3/93) - Digital
Subscriber Signalling System No 1 (DSS1) - ISDN user - network
data link layer 3 - specification for basic call control .
RFCs
RFCs
Title
No new or modified RFCs are supported by this
feature.
—
MIBs
MIBs
•
RFC 1406 MIB
•
T1 CSU MIB Support
•
Port Module MIB
•
T1/E1 Line Status Reporting
MIBs Link
To locate and download MIBs for selected platforms, Cisco IOS
releases, and feature sets, use Cisco MIB Locator found at the
following URL:
http://www.cisco.com/go/mibs
Technical Assistance
Description
Link
Technical Assistance Center (TAC) home page,
containing 30,000 pages of searchable technical
content, including links to products, technologies,
solutions, technical tips, and tools. Registered
Cisco.com users can log in from this page to access
even more content.
http://www.cisco.com/public/support/tac/home.shtml
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Command Reference
Command Reference
This section documents modified commands and commands commonly used with this feature. Due to
the complexity of some of these commands, they may be presented here in abbreviated form. The
complete platform and syntax information for these commands and all other commands used with this
feature are documented in the Cisco IOS Release 12.3 Voice Configuration Library.
•
channel-group
•
codec complexity
•
connect
•
connect (drop-and-insert)
•
ds0-group
•
groundstart auto-tip
•
pri-group
•
tdm-group
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channel-group
channel-group
To configure serial WAN on a T1 or E1 interface, use the channel-group command in controller
configuration mode. To clear a channel group, use the no form of this command.
Cisco 2600 Series
channel-group channel-group-number timeslots range [speed kbps] [aim aim-slot-number]
no channel-group channel-group-number
Cisco 2611 (Cisco Signaling Link Terminal [SLT])
channel-group channel-number
no channel-group channel-number
Cisco 2600XM Series, Cisco 2691, Cisco 3631, Cisco 3660, Cisco 3725, and Cisco 3745
channel-group channel-group-number {timeslots range [speed {56 | 64}] | unframed}
[aim aim-slot-number]
no channel-group [channel-group-number timeslots range]
Cisco AS5350 and Cisco AS5400 Series
channel-group channel-group-number
no channel-group channel-group-number
Cisco MC3810
channel-group channel-number timeslots range [speed kbps}]
no channel-group [channel-number timeslots range]
Syntax Description
channel-group-number
Channel-group number on the Cisco 2600 series, Cisco 2600XM,
Cisco 2691, Cisco 3631, Cisco 3660, Cisco 3725, and Cisco 3745 routers.
When a T1 data line is configured, channel-group numbers can be values
from 0 to 23. When an E1 data line is configured, channel-group numbers
can be values from 0 to 30. Valid values can be 0 or 1 on the Cisco AS5350
and Cisco AS5400.
timeslots range
Specifies one or more time slots separated by commas, or ranges of time slots
belonging to the channel group separated by a dash. The first time slot is
numbered 1. For a T1 controller, the time slots range from 1 to 24. For an E1
controller, the time slots range from 1 to 31. You can specify a time slot range
(for example, 1-29), individual time slots separated by commas (for example
1, 3, 5), or a combination of the two (for example 1-14, 15, 17-31). See the
“Examples” section for samples of different timeslot ranges.
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channel-group
speed {56 | 64}
(Optional) Specifies the speed of the underlying DS0s in kilobits per second.
Valid values are 56 and 64.
The default line speed when configuring a T1 controller is 56 kbps on the
Cisco 2600 series, Cisco 2600XM series, Cisco 2691, Cisco 3631,
Cisco 3660, Cisco 3725, Cisco 3745, and the Cisco MC3810.
The default line speed when configuring an E1 controller is 64 kbps on the
Cisco 2600 series, Cisco 2600XM series, Cisco 2691, Cisco 3631,
Cisco 3660, Cisco 3725, Cisco 3745, and the Cisco MC3810.
The line speed controls real-time (VBR-RT) traffic shaping, and the
maximum burst size (MBS) is 255 cells.
Defaults
aim aim-slot-number
(Optional) Directs HDLC traffic from the T1/E1 interface to the
AIM-ATM-VOICE-30 digital signaling processor (DSP) card on the
Cisco 2600 series, Cisco 2600XM series, Cisco 2691, Cisco 3631,
Cisco 3660, Cisco 3725, and Cisco 3745.
channel-number
Number of the channel. Valid values can be 0 or 1 on the Cisco SLT
(Cisco 2611).
unframed
Specifies the use of all 32 time slots for data. None of the 32 time slots are
used for framing signals on the Cisco 2600XM series, Cisco 2691,
Cisco 3631, Cisco 3660, Cisco 3725, and Cisco 3745. This is applicable to
E1 only.
The T1/E1 line is connected to the Motorola MPC-860x processor serial communication controller
(SCC) or network module with two voice or WAN interface card (VIC or WIC) slots and 0/1/2
FastEthernet ports DSCC4 by default on Cisco 2600 series, Cisco 2600XM, Cisco 2691, Cisco 3631,
Cisco 3660, Cisco 3725, and Cisco 3745 routers.
There is no default behavior or values on the Cisco SLT (Cisco 2611).
The serial interface object encapsulation is set to HDLC on a network access server (NAS)
(Cisco AS5350 and Cisco AS5400 series routers).
The default line speed is 56 kbps when a T1 controller is configured on the Cisco 2600 series,
Cisco 2600XM series, Cisco 2691, Cisco 3631, Cisco 3660, Cisco 3725, Cisco 3745, and the
Cisco MC3810.
The default line speed is 64 kbps when an E1 controller is configured on the Cisco 2600 series,
Cisco 2600XM series, Cisco 2691, Cisco 3631, Cisco 3660, Cisco 3725, Cisco 3745, and the
Cisco MC3810.
Command Modes
Controller configuration
Command History
Release
Modification
11.3 MA
This command was introduced on the Cisco MC3810.
12.0
This command was integrated into Cisco IOS Release 12.0 on the
Cisco MC3810.
12.0(7)XE
This command was implemented on the Catalyst 6000 family switches.
12.1(1)E
This command was integrated into Cisco IOS Release 12.1(1)E.
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channel-group
Usage Guidelines
Note
Release
Modification
12.1(1)T
This command was modified to accommodate two channel groups on a port
on 1- and 2-port T1/E1 Multiflex voice or WAN interface cards on the
Cisco 2600 and Cisco 3600 series routers.
12.1(3a)E3
The number of valid values for kbps was changed on the Cisco MC3810; see
the “Usage Guidelines” section for valid values.
12.2(11)T
This command was modified for use on the Cisco AS5350 and
Cisco AS5400.
12.2(15)T
The aim keyword was added for use on the Cisco 2600 series (including the
Cisco 2691), Cisco 2600XM, Cisco 3660, Cisco 3725, and Cisco 3745.
12.3(1)
The unframed keyword was added for use on the Cisco 2600XM series,
Cisco 2691, Cisco 3631, Cisco 3660, Cisco 3725, and Cisco 3745.
Use this command to direct High-Level Data Link Control (HDLC) traffic from the T1/E1 interface to
the AIM-ATM-VOICE-30 DSP card. A channel group is created using Advanced Integration Module
(AIM) HDLC resources when a channel-group command with the aim keyword is parsed during system
initialization or when the command is entered during configuration. You must specify the aim keyword
under a T1/E1 controller port to direct HDLC traffic from the T1/E1 interface to the
AIM-ATM-VOICE-30 DSP card on the Cisco 2600 series, Cisco 2600XM series, Cisco 2691,
Cisco 3631, Cisco 3660, Cisco 3725, and Cisco 3745.
Neither the Cisco AS5400 series NAS nor the Cisco MC3810 is supported with the integrated voice and
data WAN on T1/E1 interfaces using the AIM-ATM-VOICE-30 module.
If previous channel-group commands are configured with the aim keyword, subsequent channel-group
commands without the aim keyword are rejected. Similarly, if a regular channel-group command is
followed by another channel-group command with the aim keyword implemented, the second command
is rejected on the Cisco 2600 and Cisco 2600XM.
A channel group using AIM HDLC resources is deleted only when a no channel-group command is
entered.
By default, the channel-group command on a NAS sets the serial interface object encapsulation to
HDLC. You must override the default by entering the encapsulation ss7 command for that serial
interface object. Once you override the default, encapsulation cannot be changed again for that object.
The SS7 encapsulation option is new to the Integrated Signaling Link Terminal feature and is
available only for interface serial objects created by the channel-group command. The Integrated
Signaling Link Terminal feature added SLT functionality on Cisco AS5350 and Cisco AS5400
platforms.
A digital SS7 link can be deleted by entering the no channel-group channel-group-number command
on the associated T1/E1 controller. The link must first be stopped using the no shutdown command. It
is not necessary to remove the channel ID association first.
Use the channel-group command in configurations where the router or access server must communicate
with a T1 or E1 fractional data line. The channel group number may be arbitrarily assigned and must be
unique for the controller. The time slot range must match the time slots assigned to the channel group.
The service provider defines the time slots that comprise a channel group.
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channel-group
Note
Channel groups, channel-associated signaling (CAS) voice groups, and time-division multiplexing
(TDM) groups all use group numbers. All group numbers configured for channel groups, CAS voice
groups, and TDM groups must be unique on the local Cisco MC3810 concentrator. For example, you
cannot use the same group number for a channel group and for a TDM group. Furthermore, on the Cisco
MC3810, only one channel group can be configured on a controller.
The channel group number can be 0 or 1 on the Cisco SLT (Cisco 2611).
The channel-group command also applies to Voice over Frame Relay, Voice over ATM, and Voice over
HDLC on the Cisco MC3810.
Examples
The following example shows basic configuration directing HDLC traffic from the T1/E1 interface to
the AIM-ATM-VOICE-30 DSP card, starting in global configuration mode:
Router(config)# controller e1 1/0
Router(config-controller)# clock source internal
Router(config-controller)# channel-group 0 timeslots 1-31 aim 0
The following example explicitly sets the encapsulation type to PPP to override the HDLC default:
Router# configure terminal
Router(config)# controller t1 6/0
Router(config-controller)# channel-group 2 timeslots 3 aim 0
Router(config-controller)# exit
Router(config)# interface serial 6/0:2
Router(config-if)# encapsulation ppp
Router(config-if)# ip address 12.0.0.1 255.0.0.0
Router(config-if)# no shutdown
Router(config-if)# end
The following example shows how to explicitly set the encapsulation type to SS7 to override the HDLC
default using the Integrated Signaling Link Terminal feature. This example uses an 8PRI DFC card
inserted into slot 7, and DS0-timeslot 3 on trunk 5 of that card is used as an SS7 link:
Router# configure terminal
Router(config)# controller t1 7/5
Router(config-controller)# channel-group 2 timeslots 3
Router(config-controller)# exit
Router(config)# interface serial 7/5:2
Router(config-if)# encapsulation ss7
Router(config-if)# channel-id 0
Router(config-if)# no shutdown
Router(config-if)# end
The following example defines three channel groups. Channel-group 0 consists of a single time slot,
channel-group 8 consists of seven time slots and runs at a speed of 64 kbps per time slot, and
channel-group 12 consists of two time slots.
Router(config-controller)# channel-group 0 timeslots 1
Router(config-controller)# channel-group 8 timeslots 5,7,12-15,20 speed 64
Router(config-controller)# channel-group 12 timeslots 2
The following example configures a channel group on controller T1 0 on a Cisco MC3810:
Router(config)# controller T1 0
Router(config-controller)# channel-group 10 timeslots 10 64
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channel-group
Note
Related Commands
SS7 digital F-link support for the 8PRI line card requires use of a third onboard TDM stream to route
trunk DS0 messages to the onboard Media Gateway Controllers (MGCs).
Command
Description
framing
Specifies the frame type for the T1 or E1 data line.
invert data
Enables channel inversion.
linecode
Specifies the line code type for the T1 or E1 line.
voice-card
Configures a card with voice processing resources and enters voice card
configuration mode.
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codec complexity
codec complexity
To specify call density and codec complexity based on the codec standard you are using, use the codec
complexity command in voice-card configuration mode. To reset the voice card to the default, use the
no form of this command.
codec complexity {flex | high | medium}
no codec complexity
Syntax Description
flex
Each DSP can support up to 16 voice channels, depending on voice traffic.
high
In high complexity, each DSP supports six voice channels encoded in any
of the following formats:
medium
Defaults
Medium complexity
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•
g711alaw—G.711 a-law 64,000 bps.
•
g711ulaw—G.711 u-law 64,000 bps.
•
g723ar53—G.723.1 Annex A 5300 bps.
•
g723ar63—G.723.1 Annex A 6300 bps.
•
g723r53—G.723.1 5300 bps.
•
g723r63—G.723.1 6300 bps.
•
g723r16—G.726 16,000 bps.
•
g726r24—G726 24,000 bps.
•
g726r32—G.726 32,000 bps.
•
g728—G.728 16,000 bps.
•
g729r8—G.729 8000 bps (default).
•
g729br8—G.729 Annex B 8000 bps.
•
fax relay—2400 bps, 4800 bps, 7200 bps, 9600 bps, 12 kbps, and
14.4 kbps.
In medium complexity, each DSP supports eight voice channels encoded in
any of the following formats:
•
g711alaw—G.711 a-law 64,000 bps.
•
g711ulaw—G.711 u-law 64,000 bps.
•
g726r16—G.726 16,000 bps.
•
g726r24—G.726 24,000 bps.
•
g726r32—G.726 32,000 bps.
•
g729r8—G.729 Annex A 8000 bps.
•
G729br8—G.729 Annex B with Annex A 8000 bps.
•
fax relay—2400 bps, 4800 bps, 7200 bps, 9600 bps, 12 kbps, and
14.4 kbps
IP Communications Voice/Fax Network Module
codec complexity
Command Modes
Voice-card configuration
Command History
Release
Modification
12.0(5)XK
This command was introduced for the Cisco 2600 and Cisco 3600 series
routers.
12.0(7)T
This command was integrated into Cisco IOS Release 12.0(7)T.
12.0(7)XK
Support was added for the Cisco MC3810 multiservice concentrator series
for use with the high-performance compression module (HCM).
12.1(2)T
This command was integrated into Cisco IOS Release 12.1(2)T.
12.2(15)ZJ
This command was integrated into Cisco IOS Release 12.2(15)ZJ and the
flex keyword was added.
12.3(4)T
This command was integrated into Cisco IOS Release 12.3(4)T.
Usage Guidelines
Codec complexity refers to the amount of processing required to perform voice compression. Codec
complexity affects the call density—the number of calls that can take place on the DSPs. With higher
codec complexity, fewer calls can be handled. Select a higher codec complexity if that is required to
support a particular codec or combination of codecs. Select a lower codec complexity to support the
greatest number of voice channels, provided that the lower complexity is compatible with the particular
codecs in use.
Before codec complexity can be changed, all the DSP voice channels must be in the idle state.
Examples
The following example sets the codec complexity to high on voice card 1 in a Cisco 2600 or Cisco 3600
series router:
voice-card 1
codec complexity high
Related Commands
Command
Description
ds0-group
Defines T1/E1 channels for compressed voice calls and the CAS method by
which the router connects to the PBX or PSTN.
show voice dsp
Displays the current status of all DSP voice channels.
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connect
connect
To define connections between T1 or E1 controller ports for the channel bank feature, use the connect
command in global configuration mode. To restore default values, use the no form of this command.
connect connection-name voice-port voice-port-number {t1 | e1} controller-number
ds0-group-number
no connect connection-name voice-port voice-port-number {t1 | e1} controller-number
ds0-group-number
Syntax Description
connection-name
A name for this connection.
voice-port
Specifies that a voice port will be used in the connection.
voice-port-number
The voice port slot number and port number.
t1
Specifies a T1 port.
e1
Specifies an E1 port.
controller-number
The location of the first T1 or E1 controller to be connected. Valid values
for the slot and port are 0 and 1.
ds0-group-number
The number identifier of the DS0 group associated with the first T1 or E1
controller port. Created by using the ds0-group command. Valid values are
from 0 to 23 for T1 and from 0 to 30 for E1.
Defaults
There is no drop-and-insert connection between the ports.
Command Modes
Global configuration
Command History
Release
Modification
12.0(5)XK
This command was introduced.
12.0(7)T
This command was integrated into Cisco IOS Release 12.0(7)T.
12.2(15)ZJ
The voice-port keyword was added.
12.3(4)T
This command was integrated into Cisco IOS Release 12.3(4)T.
Usage Guidelines
The connect command creates a named connect between two DS0 groups associated with voice ports on
T1 or E1 interfaces where the groups have been defined by the ds0-group command.
Examples
The following example shows how to configure a channel bank connection for FXS loop-start signaling:
Router(config)# controller t1 1/0
Router(config-controller)# ds0-group 1 timeslot 0 type fxo-loop-start
Router(config-controller)# exit
Router(config)# voice-port 1/1/0
Router(config-voiceport)# signal-type fxs-loop-start
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connect
Router(config-voiceport)# exit
Router(config)# connect connection1 voice-port 1/1/0 t1 1/0 0
Related Commands
ds0-group
Specifies the DS0 time slots that make up a logical voice port on a T1 or E1
controller and the signaling type by which the router communicates with the
PBX or PSTN.
show connect
Displays configuration information about drop-and-insert connections that
have been configured on a router.
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connect (drop-and-insert)
connect (drop-and-insert)
To define connections among T1 or E1 controller ports for drop-and-insert (also called TDM
cross-connect), use the connect command in global configuration mode. To restore default values, use
the no form of this command.
connect id {t1 | e1} slot/port1 tdm-group1 {t1 | e1} slot/port2 tdm-group2
no connect id {t1 | e1} slot/port1 tdm-group1 {t1 | e1} slot/port2 tdm-group2
Syntax Description
id
A name for this connection.
t1
Specifies a T1 port.
e1
Specifies an E1 port.
slot/port1
The location of the first T1 or E1 controller to be connected. Valid values
for slot and port are 0 and 1.
tdm-group1
The number identifier of the TDM group associated with the first T1 or E1
controller port and created by using the tdm-group command. Valid values
are from 0 to 23 for T1 and from 0 to 30 for E1.
slot/port2
The location of the second T1 or E1 controller port to be connected. Valid
values for the slot argument are from 0 to 5, depending on the platform.
Valid values for the port argument are 0 to 3, depending on the platform and
the presence of a network module.
tdm-group2
The number identifier of the TDM group associated with the second T1 or
E1 controller and created by using the tdm-group command. Valid values
are from 0 to 23 for T1 and from 0 to 30 for E1.
Defaults
There is no drop-and-insert connection between the ports.
Command Modes
Global configuration
Command History
Release
Modification
12.0(5)XK
The command was introduced on the Cisco 2600 and 3600 series.
12.0(7)T
This command was integrated into Cisco IOS Release 12.0(7)T.
12.1(1)T
The command was modified to accommodate two channel groups on a port
for 1- and 2-port T1/E1 multiflex voice WAN interface cards (VWICs) on
the Cisco 3600 series routers.
12.3(4)T
This command was integrated into Cisco IOS Release 12.3(4)T.
Usage Guidelines
The connect command creates a named connect between two TDM groups associated with
drop-and-insert ports on T1 or E1 interfaces where you have already defined the groups by using the
tdm-group command.
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connect (drop-and-insert)
Once TDM groups are created on two different physical ports, you can use the connect command to start
the passage of data between the ports.
The VWIC can make a connection only if the number of time slots at the source and destination are the
same. For the connection to be error-free, the two ports must be driven by the same clock source;
otherwise, "slips" will occur.
Examples
The following example shows a fractional T1 terminated on port 0 using time slots 1 through 8; a
fractional T1 is terminated on port 1 using time slots 2 through 12; and time slots 13 through 20 from
port 0 are connected to time slots 14 through 21 on port 1 by using the connect command:
controller t1 0/0
channel-group 1 timeslots 1-8 tdm-group 1 timeslots 13-20
exit
controller t1 0/1
channel-group 1 timeslots 2-12 tdm-group 2 timeslot 14-21
exit
connect connection1 t1 0/0 1 t1 0/1 2
Related Commands
Command
Description
show connect
Displays configuration information about drop-and-insert connections that
have been configured on a router.
tdm-group
Configures a list of time slots for creating clear channel groups
(pass-through) for TDM cross-connect.
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ds0-group
ds0-group
To specify the DS0 time slots that make up a logical voice port on a T1 or E1 controller and to specify
the signaling type by which the router communicates with the PBX or public switched telephone network
(PSTN), use the ds0-group command in controller configuration mode. To remove the group and
signaling setting, use the no form of this command.
ds0-group ds0-group-number timeslots timeslot-list type {e&m-delay-dial | e&m-fgd |
e&m-immediate-start | e&m-wink-start | fxo-ground-start | fxo-loop-start |
fxs-ground-start | fxs-loop-start}
no ds0-group ds0-group-number
Syntax Description
ds0-group-number
A value from 0 to 23 that identifies the DS0 group.
timeslots timeslot-list
A single time-slot number, a single range of numbers, or multiple ranges of
numbers separated by commas. For T1, allowable values are from 1 to 24.
Examples are as follows:
2
•
1-15,17-24
•
1-23
•
2,4,6-12
type
The signaling method selection for the type keyword depends on the
connection that you are making. The FXS interface allows connection of
basic telephone equipment and PBX. The FXO interface is for connecting
the CO to a standard PBX interface where permitted by local regulations; it
is often used for OPXs.
e&m-delay-dial
e&m-fgd
The originating endpoint sends an off-hook signal and then waits
for an off-hook signal followed by an on-hook signal from the
destination.
E&M Type II Feature Group D.
e&m-immediate-start
E&M immediate start.
e&m-wink-start
The originating endpoint sends an off-hook signal and waits for a wink start
from the destination.
fxo-ground-start
Specifies FXO ground-start signaling.
fxo-loop-start
Specifies FXO loop-start signaling.
fxs-ground-start
FXS ground-start signaling.
fxs-loop-start
FXS loop-start signaling.
none
Null signaling for external call control.
Defaults
No DS0 group is defined.
Command Modes
Controller configuration
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ds0-group
Command History
Usage Guidelines
Release
Modification
11.2
This command was introduced for the Cisco AS5300 universal access server
as the cas-group command.
11.3(1)MA
This command was introduced as the voice-group command for the
Cisco MC3810 multiservice concentrator.
12.0(1)T
The cas-group command was introduced for the Cisco 3600 series routers.
12.0(5)T
The command was renamed ds0-group on the Cisco AS5300 and
Cisco 2600 and 3600 series routers. Keyword modifications were added.
12.0(5)XE
This command was introduced for the Cisco 7200 series.
12.0(7)XK
Support for this command was extended to the Cisco MC3810 multiservice
concentrator. When the ds0-group command became available on the
Cisco MC3810 multiservice concentrator, the voice-group command was
removed and no longer supported. The ext-sig keyword replaced the
ext-sig-master and ext-sig-slave keywords that were available with the
voice-group command.
12.0(7)XR
The mgcp service type was added.
12.1(1)T
The ds0-group command was implemented for the Cisco 7200 series.
12.1(2)XH
The e&m-fgd and fgd-eana keywords were added for Feature Group D
signaling.
12.1(3)T
This command was modified for the Cisco 7500 series routers. The fgd-os
signaling type and the voice service type were added.
12.2(15)ZJ
This command was integrated into Cisco IOS Release 12.2(15)ZJ.
12.3(4)T
This command was integrated into Cisco IOS Release 12.3(4)T.
The ds0-group command automatically creates a logical voice port that is numbered as follows:
slot/port:ds0-group-number
Although only one voice port is created for each group, applicable calls are routed to any channel in the
group.
Examples
The following example shows ranges of T1 controller time slots configured for FXS ground-start and
FXO loop-start signaling on a Cisco 2600 or 3600 series router:
T1 1/0
framing esf
linecode b8zs
ds0-group 1 timeslots 1-10 type fxs-ground-start
ds0-group 2 timeslots 11-24 type fxo-loop-start
Related Commands
Command
Description
codec
Specifies the voice coder rate of speech for a dial peer.
codec complexity
Specifies call density and codec complexity based on the codec standard you
are using.
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groundstart auto-tip
groundstart auto-tip
To configure a timing delay on an FXO groundstart voice port, use the groundstart auto-tip command
in voice-port configuration mode. To disable the configured timeout, use the no form of this command.
groundstart auto-tip [delay timer]
no groundstart auto-tip [delay timer]
Syntax Description
delay
Indicates that a specific delay time will be configured.
timer
Specifies the wait time in milliseconds that the FXO groundstart voice port
will wait for a tip ground acknowledgment.
Defaults
This command is disabled by default. If the command is used without the optional keyword, the default
time of 200 ms is activated.
Command Modes
Voice-port configuration
Command History
Release
Modification
12.3(11)T2
This command was introduced into Cisco IOS Release 12.3(11)T2.
Usage Guidelines
This command should only be used after you encounter call setup problems involving FXO groundstart
analog voice ports. If these problems occur, first load the latest image for your Cisco IOS Release (for
example, if you are running Release 12.3(11)T, you should replace this image with Release 12.3(11)T2.
Upgrading the software image should eliminate the problem. If not, then use this command as a
troubleshooting measure—it should be enabled in a configuration only if you encounter problems in
connecting outgoing calls. After the groundstart auto-tip command is configured, the problem should
not occur again.
Use the groundstart auto-tip command only for voice ports configured for FXO groundstart signaling.
The following example sets the delay wait time for tip ground acknowledgment to 250 ms:
Router# configure terminal
Router(config)# voice-port 2/0/0
Router(config-voiceport)# shutdown
Router(config-voiceport)# groundstart auto-tip delay 250
Router(config-voiceport)# no shutdown
Router(config-voiceport)# exit
Related Commands
Command
Description
voice-port
Specifies that a voice port will be used in the connection.
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pri-group
pri-group
To specify ISDN PRI on a channelized T1 or E1 controller, use the pri-group command in controller
configuration mode. To remove the ISDN PRI configuration, use the no form of this command.
pri-group [timeslots range]
no pri-group
Syntax Description
timeslots range
Defaults
No ISDN PRI group is configured.
Command Modes
Controller configuration
Command History
Release
Usage Guidelines
Note
Examples
(Optional) Specifies a single range of values from 1 to 24 for T1. For E1, the
allowable range is from 1 to 31. You can specify a time slot range (for example,
1-29), individual time slots separated by commas (for example 1, 3, 5), or a
combination of the two (for example 1-14, 15, 17-31).
Modification
11.0
This command was introduced.
12.2(15)ZJ
This command was integrated into Cisco IOS Release 12.2(15)ZJ.
12.3(4)T
This command was integrated into Cisco IOS Release 12.3(4)T.
Before you enter the pri-group command, you must specify an ISDN switch type for PRI and a T1
controller.
Only one PRI group can be configured on a controller.
The following example specifies ISDN PRI on T1 slot 1, port 0:
isdn switch-type primary-4ess
controllers t1 1/0
framing esf
linecode b8zs
pri-group timeslots 2-6
Related Commands
Command
Description
controller
Configures a T1 or E1 controller and enters controller configuration mode.
framing
Specifies a frame type.
isdn switch-type
Specifies the central office switch type on the ISDN PRI interface.
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pri-group
Command
Description
linecode b8zs
Specifies line encoding for a controller.
interface serial
Specifies a serial interface created on a channelized E1 or channelized T1
controller (for ISDN PRI, CAS, or robbed-bit signaling).
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tdm-group
tdm-group
To configure a list of time slots for creating clear channel groups (pass-through) for time-division
multiplexing (TDM) cross-connect, use the tdm-group command in controller configuration mode. To
delete a clear channel group, use the no form of this command.
tdm-group tdm-group-number timeslot timeslot-list [type {fxs [loop-start | ground-start] | fxo
[loop-start | ground-start]}]
no tdm-group tdm-group-number timeslot timeslot-list [type {fxs [loop-start | ground-start] | fxo
[loop-start | ground-start]}]
Syntax Description
tdm-group-number
TDM group number.
timeslot
Time-slot number.
timeslot-list
Time-slot list. The valid range is from 1 to 24 for T1, and from 1 to 15 and
17 to 31 for E1.
type
(Optional) (Valid only when the mode cas command is enabled.) Specifies
the voice signaling type of the voice port. If configuring a TDM group for
data traffic only, do not specify the type keyword.
e&m
Connects PBX trunk lines (tie lines) and telephone equipment. The wink and
delay settings both specify confirming signals between the sending and
receiving ends, or the immediate setting stipulates no special offhook or
onhook signal.
fxs
Foreign Exchange Station signaling. Connects a central office (CO) to a
standard PBX interface where permitted by local regulations. (Optionally,
you can also specify loop-start or ground-start.)
fxo
Foreign Exchange Office signaling. Connects basic telephone equipment and
PBXs. (Optionally, you can also specify loop-start or ground-start.)
Defaults
No TDM group is configured.
Command Modes
Controller configuration
Command History
Release
Modification
11.3(1)MA
This command was introduced on Cisco MC3810 multiservice
concentrators.
12.1(1)T
This command was modified to include voice WAN interface cards
(VWICs) for Cisco 2600 and Cisco 3600 series routers.
12.1(2)T
This command was modified for the OC-3/STM-1 ATM Circuit Emulation
Service network module on the Cisco 2600 and 3600 series routers.
12.2(15)ZJ
This command was integrated into Cisco IOS Release 12.2(15)ZJ.
12.3(4)T
This command was integrated into Cisco IOS Release 12.3(4)T.
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tdm-group
Usage Guidelines
Note
Examples
The tdm-group command allows specific time slots to switch from port 0 to port 1 and vice versa. This
command is similar to the channel-group command, but it does not create a serial interface to terminate
the specified channels.
Channel groups, CAS voice groups, and TDM groups all use group numbers. All group numbers
configured for channel groups, CAS voice groups, and TDM groups must be unique on the local router.
For example, you cannot use the same group number for a channel group and for a TDM group.
The following example shows TDM group 1 being set up to include time slots 13 through 20:
tdm-group 1 timeslots 13-20
The following example configures TDM group number 20 to support FXS ground-start:
tdm-group 20 timeslot 20 type fxs ground-start
Related Commands
Command
Description
connect
Starts passage of data between ports for cross-connect TDM.
channel-group
Configures serial WAN on a T1 or E1 interface.
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Glossary
Glossary
ALI—Automatic Location Identification.
ANI—Automatic Number Identification B-channel asymmetric digital subscriber line.
BSP—Buffered Serial Port.
caller ID—A central office function where a call on an analog line sends a burst of modem tones
between the first and second rings to the phone; the data burst contains the phone number (and
sometimes the name) of the caller.
CDR—Call Detail Record.
CID or CLID—Caller Identification (North America uses 1200 baud FSK between first and second ring
burst) or calling Line ID.
codec—coder-decoder. Algorithm that compresses or decompresses the data.
D channel—Data channel in an ISDN system that contains call setup, teardown, and X.25 packet data.
DSP—digital signal processor.
DTMF—dual tone multifrequency. Analog in-band signaling (such as touch-tone dialing).
FXS—Foreign Exchange Station used to connect directly to phones, fax machines, and key systems.
FXO—ForeigN Exchange Office. An FXO interface connects to a central office. This is the interface a
standard telephone offers.
FXO-M1—FXO voice/fax interface card with battery reversal detection and caller ID support for the
United States, Canada, Japan, and others.
FXO-M2—FXO voice/fax interface card with battery reversal detection and caller ID support for
Europe.
FXO-M3—FXO voice/fax interface card with battery reversal detection and caller ID support for
Australia.
H.323—This ITU-T standard defines a set of call control, channel setup, and codec specifications for
sending real-time voice and video over networks that do not offer guaranteed quality of service.
M1—A POTS interface meeting U.S. requirements with battery reversal detection and CID, and
termination impedance of 600 ohms resistive.
M2—A POTS interface meeting European requirements with battery reversal detection and CID, and
termination impedance of 270 ohms plus 750 ohms in parallel with 150nF.
M3—A POTS interface meeting Australian requirements with battery reversal detection and CID, and
termination impedance of 220 ohms plus 820 ohms in parallel with 120nF.
MF—multifrequency.
MGCP—Media Gateway Control Protocol.
NT—Network Termination.
NT1—Network Termination point 1 in ISDN.
NT2—Network Termination point 2 in ISDN.
ONS—On Premises Service for PABXs per EIA/TIA-464.
OPS—Off Premises Service for PABXes per EIA/TIA-464.
PBX/PABX—private (automated) branch exchange.
PSAP—Public Safety Answering Point. A facility equipped and staffed to receive 911 calls.
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Glossary
PSTN—public switched telephone network. Standard analog telephony infrastructure.
S0(S/T)—Subscriber line designation 0 for subscriber terminals using 4-wire full-duplex interfaces
containing two B channels + one D channel + monitor overhead.
SLIC—Subscriber Line Interface Circuit. An IC providing central office-like telephone interface
functionality.
S/T—Interface 4-wire interface presented by an NT to TEs.
SIP—Session Initiation Protocol.
TE—terminal equipment.
VoIP—Voice over IP. Blanket term that generally notes Cisco's standards based (H.323, and so on)
approach to IP voice traffic.
VIC—voice interface card. A version of WIC but with a TDM I/F.
Note
Refer to Internetworking Terms and Acronyms for terms not included in this glossary.
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